258 MR. W. K. PARKER ON THE STRUCTURE AND 
Stuge 2 (B).—Young of Galeopithecus philippensis; 8 cnches long from snout to 
root of tail, 
The investing bones of the skull. 
The side view of the skull (Plate 38, fig. 4) reminds one of that of an Ewe, or of a 
Llama, just as the incus, as we have seen, is like that of the Ruminants ; the side 
view of the head in the embryo of the other species (Plate 16, fig. 154) suggests the 
same resemblance. Anyhow, whatever it is Véke, the skull is as unlike that of a 
normal Insectivore as it can well be. The centre of the orbit is at the middle of the 
length of the whole skull, including the snout; the facial part is much shorter in the 
embryo of the other kind (compare Plate 38, figs. 1 and 4). More than a third of 
this large orbit—Lemurine as to size—is unenclosed behind ; it is more circular than 
in the young specimen. Through advanced growth, the hollow over the fore part of 
the orbits, and the deflection of the snout, are less marked. Now, the highest convex 
part, above, is parietal (p.), and the supraorbital ridge is higher than the upper face 
of the frontals cay and the convex dorsal line of the nasals (n.) is a little less 
rounded, The embryonic curve of the whole skull is now much less evident ; but 
the straightening process is not finished yet. The premaxillary ( px.) rans further 
into the maxillary (w.) in the facial suture, and the latter is much more outspread 
in the preorbital region, quite flush with the lachrymal (/.) The latter bone encloses a 
fourth of the orbit, and a third of its actual rim, Its canal is well inside the edge, as 
in the Hyrax, and not outside as in Bats, Lemurs, and most Marsupials. These latter, 
asa rule, have two canals—one in Phalangista. The facial part of the lachrymal is a 
large lunule and the orbital a thin polygonal plate. The small double infraorbital 
foramen (V*.) 1s below the convex preorbital margin of the maxillary. The developed 
orbital rim hides the inner opening when looked at in this aspect. The orbital edge 
and postorbital process of the jugal (j.) are better grown now, and the latter is not 
so far back; it is nearly over the middle of the well-developed cheek-bone. A tri- 
radiate concavity traverses the Jarge orbital plate of the strong-browed frontal (75 
that shallow fossa ends below and behind in a rounded notch, which is made into 
a foramen (f. orbitale) for the re-admission of the ophthalmic nerve (V4) inside the 
skull-wall. The frontal bone interdigitates with the parietal (p.) under and behind 
the postorbital process, and then that gently swelling roof-bone runs back to the trans- 
verse interparietal (7.p.). Behind the f. opticum (see fig. 1, II.), the large alisphenoid 
wedges apart the frontal, parietal, and squamosal ; the latter (sq.) is squarish, and large 
enough to hide most of the side of the bind skull; it corresponds with that of an 
Eastern Marsupial ; in Didelphys it is much smaller; it is in remarkable contrast 
with that of Hrinaceus and Rhynchocyon (Plate 20, fig. 3; and Plate 86, fig. 3); in 
Pteropus and Lepilenur the pavietals throw the squamosal down to the side, and, in 
their much fuller growth, overshadow it. 
eS ee os 
